<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>多行三行模式布局</title>
    <link rel="stylesheet" href="mycss.css" type="text/css" />
  </head>
  <body>
    <div id="container" class="">
      <div id="header" class="">
        <div id="logo" class="">logo</div>
        <div id="nav" class="">nav</div>
      </div>
      <div id="main" class="">
        <div id="left" class="">
          <div id="left_up_1" class="">left_up_1</div>
          <div id="left_up_2" class="">left_up_2</div>
          <div id="left_down_1" class="">left_down_1</div>
          <div id="left_down_2" class="">left_down_2</div>
        </div>
        <div id="center" class="">
          <div id="center_up" class="">center_up</div>
          <div id="center_down" class="">center_down</div>
        </div>
        <div id="right" class="">
          <div id="right_up" class="">right_up</div>
          <div id="right_down" class="">right_down</div>
        </div>
      </div>
      <div id="footer" class="">footer</div>
    </div>
  </body>
</html>
